Water-based woodware varnish as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a water-based woodware varnish as well as a preparation method and application thereof. The water-based wood top-coat comprises a water-based emulsion, an organosilicon compound, a functional additive, a thickening agent, a wetting agent and water, the water-based emulsion comprises a self-crosslinking acrylic copolymer emulsion and an emulsion A; the emulsion A is selected from any one of self-crosslinking acrylic acid homopolymerized emulsion and polycarbonate modified polyurethane emulsion; the organosilicon compound comprises at least one of silane and silanol; the functional auxiliary agent comprises any one of a functional auxiliary agent 1 and a functional auxiliary agent 2; the functional additive 1 comprises a mildew preventive A and a mildew preventive B; the functional auxiliary agent 2 comprises a mildew preventive C, an ultraviolet light absorber and an ultraviolet light stabilizer; the thickeners include high shear, medium shear, and low shear polyurethane thickeners. The water-based woodware varnish disclosed by the invention has good comprehensive properties such as mildew resistance, weather resistance, chemical resistance and blocking resistance, and can be used for coating outdoor woodware or semi-outdoor woodware.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and specifically relates to a water-based wood clear topcoat, its preparation method, and its application. Background Technology

[0002] In recent years, with social development and increasingly higher environmental protection requirements, water-based wood products have experienced rapid development and widespread application. However, these products are mainly limited to specific furniture sub-sectors. For interior products, water-based wood coatings are widely used in furniture, flooring, and other fields, with some products exhibiting performance close to oil-based paints and demonstrating significant environmental advantages.

[0003] For outdoor wooden products, certain performance issues still need to be addressed. For example, wooden furniture is prone to discoloration, cracking, and mold growth. These problems are particularly pronounced in hot and humid summers and cold and damp winters. One specific issue is poor weather resistance and mold resistance. When coated wooden products are used in outdoor settings such as pavilions, fences, and railings, they are susceptible to expansion and contraction due to rain and sunlight, leading to yellowing, cracking, and mold growth. Another issue is the need to improve chemical resistance, stain resistance, and anti-adhesion properties. Coated wooden products used on balconies, outdoor tables and chairs, and boardwalks are prone to adhesion; and unavoidable contact with common household chemicals and stains, such as baking soda, can easily cause discoloration of the paint film.

[0004] Existing technologies mainly improve wood clear coats through the following technical approaches: 1) Alkyd resin systems or water-based alkyd emulsion systems. 2) Water-based acrylic emulsion systems or modified acrylic emulsion systems, such as: single self-crosslinking acrylic resin dispersions (minimum film-forming temperature (MFFT) of 0-12℃, glass transition temperature (Tg) of -20~120℃) or self-crosslinking nanoscale polymers or self-crosslinking pure acrylic emulsions (MFFT of -5℃) or silicone-modified acrylic copolymer emulsions. These form a flexible paint film after film formation to compensate for minor cracks in the wood, preventing rapid corrosion due to cracking and direct exposure to rain and sunlight. However, alkyd systems or water-based alkyd emulsion systems have slow-drying paint films, and while they possess flexibility, their anti-blocking properties are poor. They are generally used for "non-contact" surface coating of outdoor wood products and are not suitable for "contact" surface coating of outdoor wood products or semi-outdoor wood products such as balconies. Furthermore, the protection of outdoor wood products mainly consists of two parts: firstly, reinforcing the wood by penetrating into the lignin, and secondly, forming a resilient paint film on the wood surface. However, single acrylic emulsions or their modified forms cannot effectively address both of these protective mechanisms, resulting in poor protective performance.

[0005] In addition, due to the thermal expansion and contraction of wood products, especially in the hot and humid environment of summer and the cold and humid environment of winter, the protective coating often fails within 2 years, causing the wood products to crack and mold, making it difficult to achieve long-term decorative protection in outdoor settings.

[0006] Therefore, it is of great significance to provide a water-based wood clear topcoat with good anti-blocking, weather resistance, mildew resistance and chemical resistance. Summary of the Invention

[0007] The present invention aims to solve one or more technical problems existing in the prior art, and at least provide a beneficial solution. Specifically, the present invention provides a water-based wood clear topcoat, which has good anti-blocking properties, weather resistance, mildew resistance, and chemical resistance.

[0008] The inventive concept of this invention: The water-based wood clear topcoat of this invention comprises an water-based emulsion, an organosilicon compound, functional additives, a thickener, a wetting agent, and water; the water-based emulsion comprises a self-crosslinking acrylic copolymer emulsion and emulsion A; emulsion A is selected from any one of self-crosslinking acrylic homopolymer emulsion and polycarbonate-modified polyurethane emulsion; the organosilicon compound comprises at least one of silane and silanol; the functional additives comprise any one of functional additive 1 and functional additive 2; the functional additives... Agent 1 includes antifungal agent A and antifungal agent B; the functional additive 2 includes antifungal agent C, ultraviolet light absorber and ultraviolet light stabilizer; antifungal agent A includes 2-octyl-3(2H)-isothiazolidinone; antifungal agent B includes 3-iodo-2-propynyl butylcarbamate; antifungal agent C includes 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone; the thickener includes high-shear polyurethane thickener, medium-shear polyurethane thickener and low-shear polyurethane thickener.

[0009] This invention utilizes a self-crosslinking acrylic copolymer emulsion combined with a self-crosslinking acrylic homopolymer emulsion or a polycarbonate-modified polyurethane emulsion, along with silanol (or silane) and functional additives. These components work synergistically to form an organic-inorganic hybrid hydrophobic coating that effectively resists external erosion (rain and sun exposure), exhibiting excellent anti-blocking properties, weather resistance, and chemical resistance. Furthermore, it establishes multiple anti-mildew mechanisms to effectively prevent the wood's internal decay (lignin, etc.) and the coating from developing mold in the usage environment. This makes it particularly suitable for use in hot and humid environments in summer and cold and humid environments in winter.

[0010] The inorganic components produced by the hydrolysis and condensation of silanols or silanes, and the organic components of the emulsion molecular chains, are chemically bonded together to achieve a higher anchoring effect. The interaction between organic and inorganic components builds a surface structure that not only significantly reduces the water contact angle and provides excellent hydrophobicity, minimizing rainwater retention time, but also enhances the weather resistance and anti-blocking properties of the paint film. Simultaneously, the addition of specific functional additives protects lignin through penetration and forms a tough paint film on the surface of wooden furniture, preventing cracking caused by thermal expansion and contraction and preventing internal corrosion and decay. Furthermore, the presence of anti-mold components in the paint film effectively resists the penetration and growth of mold in the air, enhancing external protection. In addition, the combination of wetting agents and specific thickeners gives the water-based wood clear topcoat excellent workability and a superior appearance.

[0011] Therefore, a first aspect of the present invention provides a water-based wood clear topcoat.

[0012] Specifically, the water-based wood clear topcoat includes water-based emulsion, organosilicon compound, functional additives, thickener, wetting agent, and water; The aqueous emulsion includes a self-crosslinking acrylic copolymer emulsion and emulsion A; Emulsion A is selected from either self-crosslinking acrylic homopolymer emulsion or polycarbonate modified polyurethane emulsion. The organosilicon compound includes at least one of silane and silanol; The functional additives include either functional additive 1 or functional additive 2; The functional additive 1 includes antifungal agent A and antifungal agent B; the functional additive 2 includes antifungal agent C, ultraviolet light absorber and ultraviolet light stabilizer; The antifungal agent A comprises 2-octyl-3(2H)-isothiazolidinone; the antifungal agent B comprises 3-iodo-2-propynyl butylcarbamate; the antifungal agent C comprises 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone. The thickeners include high-shear polyurethane thickeners, medium-shear polyurethane thickeners, and low-shear polyurethane thickeners.

[0013] Specifically, a schematic diagram of the surface structure constructed from water-based emulsions, organosilicon compounds, and functional additives is shown below. Figure 1 As shown. By Figure 1It can be seen that for the wood products and the lower part of the paint film, the water-based emulsion (mainly self-crosslinking acrylic copolymer emulsion) and functional additives penetrate into the lignin of the wooden furniture, and the crosslinking reaction strengthens the substrate and provides anti-mildew properties; for the upper part of the paint film, the water-based emulsion (mainly self-crosslinking acrylic homopolymer emulsion and polycarbonate modified polyurethane emulsion), organosilicon compounds, and functional additives crosslink to form a paint film with good anti-mildew properties, chemical resistance, weather resistance, hydrophobicity and other comprehensive properties on the surface of the wood products, which effectively protects the wood products and makes them particularly suitable for use in high temperature and high humidity environments in summer and cold and humid environments in winter.

[0014] Preferably, the minimum film-forming temperature of the self-crosslinking acrylic copolymer emulsion is 3-18°C.

[0015] Preferably, the minimum film-forming temperature of the self-crosslinking acrylic homopolymer emulsion is 0-15°C or 30-36°C.

[0016] Preferably, the silane comprises polysilane.

[0017] Specifically, the silane is a polysilane waterproofing agent that can generate inorganic silicon-oxygen bond components through hydrolysis and condensation, which can improve the water contact angle and enhance the hydrophobicity of the paint film. Silane oligomers are preferred.

[0018] Preferably, the silanol comprises an organosilanol.

[0019] Preferably, the organosilicon compound includes organosilicon alcohols.

[0020] Preferably, when the emulsion A is a self-crosslinking acrylic homopolymer emulsion, the mass ratio of the self-crosslinking acrylic copolymer emulsion to the self-crosslinking acrylic homopolymer emulsion is (0.8-2.7):1.

[0021] Preferably, when the emulsion A is a polycarbonate-modified polyurethane emulsion, the mass ratio of the self-crosslinking acrylic copolymer emulsion to the polycarbonate-modified polyurethane emulsion is (0.7-3.0):1.

[0022] Preferably, the weight ratio of the antifungal agent A to the antifungal agent B is 1:(0.1-0.5).

[0023] Preferably, the weight ratio of the antifungal agent C, the ultraviolet absorber, and the ultraviolet stabilizer is 1:(0.2-2.2):(0.1-1.1).

[0024] Preferably, the ultraviolet absorber comprises 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy-phenylpropionic acid-C7-9 (branched and straight) alkyl ester.

[0025] Preferably, the ultraviolet light stabilizer includes a non-basic amino ether hindered amine light stabilizer.

[0026] Preferably, the weight ratio of the high-shear polyurethane thickener, the medium-shear polyurethane thickener, and the low-shear polyurethane thickener is 1:(0.4-1.4):(0.1-0.8).

[0027] Preferably, the high-shear polyurethane thickener has a shear rate of 100-2000 s. -1 .

[0028] Preferably, the shear rate of the medium-shear polyurethane thickener is 5-15 s. -1 .

[0029] Preferably, the low-shear polyurethane thickener has a shear rate of 0.05-0.15 s. -1 .

[0030] Preferably, by weight percentage, the water-based wood clear topcoat comprises 64-90% water-based emulsion, 0.1-1.0% organosilicon compound, 0.05-3.0% functional additives, 0.2-3.0% thickener, 0.1-1.0% wetting agent, and 4-22% water.

[0031] Preferably, the water-based wood clear topcoat further includes at least one of the following: film-forming aid, defoamer, leveling agent, wax emulsion, anti-sagging agent, and bactericide.

[0032] Preferably, the water-based wood clear topcoat further includes film-forming aids, defoamers, leveling agents, wax emulsions, anti-sagging agents, and bactericides; and by weight percentage, the water-based wood clear topcoat comprises 64-90% water-based emulsion, 0.1-1.0% organosilicon compounds, 0.05-3.0% functional additives, 0.2-3.0% thickeners, 0.1-1.0% wetting agents, 2-7.0% film-forming aids, 0.2-1.0% defoamers, 0.05-1.0% leveling agents, 0.5-4.0% wax emulsions, 0.2-3.5% anti-sagging agents, 0.05-0.3% bactericides, and 4-22% water.

[0033] Preferably, the film-forming aid includes propylene glycol and alcohol ether film-forming aids.

[0034] More preferably, the film-forming aid includes propylene glycol, dipropylene glycol methyl ether (DPM), dipropylene glycol butyl ether (DPnB), and decyl alcohol ester (CZ-12); the total content meets the national standards for volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs), and also meets the national standard limits.

[0035] Preferably, the anti-sagging agent includes at least one of montmorillonite, polyamide wax paste, and polyurea paste; more preferably, the anti-sagging agent includes montmorillonite; even more preferably, the anti-sagging agent includes montmorillonite pregel liquid.

[0036] Preferably, the method for preparing the montmorillonite pregel liquid includes the following steps: Add water to a clean container, stir, add montmorillonite, increase the stirring speed and continue stirring to obtain the product.

[0037] Preferably, the stirring speed is 750-850 rpm.

[0038] Preferably, the stirring speed is 1100-1300 rpm and the stirring time is 25-35 min.

[0039] Preferably, the leveling agent includes at least one of silicone leveling agents and acrylic leveling agents.

[0040] Preferably, the defoamer includes an organosilicon defoamer, which has good defoaming stability.

[0041] Preferably, the wetting agent includes at least one of organosilicon wetting agents, acetylenic diol wetting agents, and fluorinated organosilicon wetting agents.

[0042] Preferably, the wetting agent includes an organosilicon wetting agent and a fluorinated organosilicon wetting agent.

[0043] Preferably, the weight ratio of the organosilicon wetting agent to the fluorinated organosilicon wetting agent is 1:(0.01-0.5).

[0044] Specifically, in this invention, the combination of wetting agent and thickener gives the clear topcoat good brushing, spraying and roller coating properties, especially when applied to transparent surfaces, making application unobstructed and resulting in a normal appearance of the finished paint film.

[0045] Preferably, the bactericide is a 1,2-benzisothiazolin-3-one (BIT) class bactericide.

[0046] A second aspect of the present invention provides a method for preparing the water-based wood clear varnish described in the first aspect of the present invention.

[0047] Specifically, the preparation method of the water-based wood clear topcoat includes the following steps: The raw material components are mixed to obtain the final product.

[0048] Preferably, the preparation method of the water-based wood clear topcoat includes the following steps: (1) Mix the aqueous emulsion, organosilicon compound, and defoamer to obtain mixture 1; (2) Mix some water with film-forming aid, wetting agent, leveling agent and thickener, and then add it to the mixture 1 to obtain mixture 2; (3) The wax emulsion, anti-sagging agent and functional agent are added to the mixture 2, and a pre-mixed bactericide and the remaining water are added to obtain the product.

[0049] Preferably, in step (2), the portion of water accounts for 15-50% of the total water usage.

[0050] A third aspect of the present invention provides a wood product.

[0051] Specifically, the wood products include the water-based wood clear varnish described in the first aspect of this invention.

[0052] Specifically, the wood products include outdoor wood products or semi-outdoor wood products.

[0053] Compared with the prior art, the beneficial effects of the technical solution provided by the present invention are as follows: (1) This invention combines self-crosslinking acrylic copolymer emulsion with self-crosslinking acrylic homopolymer emulsion or polycarbonate modified polyurethane emulsion, silanol (or silane), functional additives, wetting agents, thickeners, and other components. The combined effect of these components makes the water-based wood clear topcoat have good anti-mildew properties, good weather resistance, chemical resistance, stain resistance, workability, storage stability, anti-graffiti properties, and anti-blocking properties. It can be used for coating outdoor or semi-outdoor wood products.

[0054] (2) The water-based wood clear topcoat of the present invention has good anti-blocking and hydrophobic properties. The paint film does not crack, peel or turn white in the artificial weathering test (xenon lamp, 1000h or 2000h); the paint film does not crack or mold in natural sun exposure; direct application can penetrate into lignin to strengthen wood products, and at the same time form a protective paint film on the surface of wood products. After multiple protections, it can still have a long-lasting decorative and protective effect in the environment of high temperature and high humidity in summer and cold and humid winter.

[0055] (3) The preparation process of this invention is simple and easy to promote and apply in industrial applications. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the surface structure constructed from aqueous emulsion, organosilicon compound, and functional additives in Example 1 of the present invention. Figure 2 These are actual images of the water-based wood clear topcoat after the artificial weathering resistance test (xenon lamp 256h, non-solid wood board, standard state) of Embodiment 1 and Comparative Examples 1-10 of the present invention. Figure 3The images show actual products after the artificial weathering resistance test (200h xenon lamp, non-solid wood board, freeze-thaw cycle) of water-based wood clear topcoat in Examples 1-3 and Comparative Examples 11, 12, and 15 of this invention. Figure 4 These are the storage stability results of water-based wood clear topcoat in Example 1 and Comparative Examples 16-17 of the present invention; Figure 5 These are actual photos of the water-based wood clear topcoat from Examples 1-3 of the present invention after artificial weathering (1000h xenon lamp, solid wood, transparent color) tests. Figure 6 These are actual photos of the water-based wood clear topcoat of Examples 1-3 and Comparative Examples 16-18 at the beginning of outdoor exposure (transparent). Figure 7 These are actual photos of the water-based wood clear topcoat of the present invention in the transparent black walnut color at the beginning of outdoor exposure (transparent black walnut color) in Examples 1-3 of the present invention; Figure 8 These are actual photos of the water-based wood clear topcoat of Examples 1-3 and Comparative Examples 16-18 after two years of outdoor exposure (transparent). Figure 9 These are actual photos of the water-based wood clear topcoat of Embodiments 1-3 of the present invention after being exposed to the sun outdoors for three years, with the topcoat in a transparent black walnut color. Detailed Implementation

[0057] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0058] Unless otherwise specified, the raw materials, reagents or devices used in the following examples are available from conventional commercial sources or can be obtained by existing known methods.

[0059] Information on the raw materials used in the embodiments and comparative examples of this invention is shown in Table 1.

[0060] Table 1: Information on relevant raw materials in the embodiments and comparative examples of the present invention

[0061] The raw material components and dosages of the water-based wood clear topcoat of Examples 1-4 of this invention are shown in Table 2.

[0062] Table 2: Raw material components and dosage (g) of water-based wood clear topcoat in Examples 1-4 of the present invention

[0063] Example 1 Example 1 provides a water-based wood clear topcoat, the raw material components and dosages of which are shown in Table 2.

[0064] Example 1 also provides a method for preparing the above-mentioned water-based wood clear topcoat, the specific steps of which are as follows: (1) Take a clean large tank a, add two kinds of water-based emulsions, select a suitable dispersion plate, the diameter of the dispersion plate is 0.5 to the diameter of the container, start stirring at 800 rpm, add silanol and defoamer in a thin stream towards the center of the dispersion plate, stir for 5 min to obtain mixture 1; (2) Take another clean container b and add 8.5g of pure water in a thin stream. Then add the film-forming aid, wetting agent, leveling agent and thickener in sequence. Select a suitable dispersion device according to the size of the container and disperse at 600rpm for 10min until uniform to obtain mixture 2. Point the mixture 2 into the large cylinder a in a thin stream, while increasing the speed to 1800rpm. Disperse for 20min until the fineness is ≤20μm and there is no oil shrinkage on the scraper before proceeding to the next step. (3) Adjust the speed to 1000 rpm. Under stirring, add wax emulsion, anti-sagging agent and functional agent to the center of the dispersion plate of the large tank a in sequence. Stir for 5 minutes, then add the pre-mixed bactericide and the remaining pure water. Continue stirring for 10 minutes until uniform. Then reduce the speed to 400 rpm and stir for 10 minutes. After passing the inspection, filter and package to obtain the product.

[0065] Example 2 Example 2 provides a water-based wood clear topcoat, the raw material components and dosages of which are shown in Table 2.

[0066] Example 2: The preparation method of water-based wood clear topcoat is the same as that of Example 1.

[0067] Example 3 Example 3 provides a water-based wood clear topcoat, the raw material components and dosages of which are shown in Table 2.

[0068] Example 3: The preparation method of water-based wood clear topcoat is the same as that of Example 1.

[0069] Example 4 Example 4 provides a water-based wood clear topcoat, the raw material components and dosages of which are shown in Table 2.

[0070] Example 4: The preparation method of water-based wood clear topcoat is the same as that of Example 1.

[0071] Comparative Example 1 The only difference between Comparative Example 1 and Example 1 is that Comparative Example 1 uses an equal amount of self-crosslinking acrylic homopolymer emulsion SETAQUA 6799 to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98, i.e., it does not contain self-crosslinking acrylic copolymer emulsion. Otherwise, it is the same as Example 1.

[0072] Comparative Example 2 The only difference between Comparative Example 2 and Example 1 is that Comparative Example 2 uses an equal amount of Covestro NeoCryl XK-98 self-crosslinking acrylic copolymer emulsion to replace the self-crosslinking acrylic homopolymer emulsion SETAQUA 6799, i.e., it does not contain self-crosslinking acrylic homopolymer emulsion. Otherwise, it is the same as Example 1.

[0073] Comparative Example 3 The only difference between Comparative Example 3 and Example 1 is that Comparative Example 3 uses an equal amount of self-crosslinking acrylic copolymer emulsion (Alberdingk AC 3600, MFFT: 0°C, non-volatile content: 40-42wt%) to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98 and self-crosslinking acrylic homopolymer emulsion SETAQUA 6799 in Example 1. Otherwise, they are the same as in Example 1.

[0074] Comparative Example 4 The only difference between Comparative Example 4 and Example 1 is that Comparative Example 4 uses an equal amount of self-crosslinking acrylic copolymer emulsion (Wanhua Lacper 4572, MFFT: 7°C, non-volatile content: 41-43wt%) to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98 and self-crosslinking acrylic homopolymer emulsion SETAQUA 6799 in Example 1. Otherwise, they are the same as in Example 1.

[0075] Comparative Example 5 The only difference between Comparative Example 5 and Example 1 is that Comparative Example 5 uses an equal amount of self-crosslinking acrylic homopolymer emulsion (Zhanxin SETAQUA 6784 acrylic emulsion, MFFT: 23°C, non-volatile content: 43-45wt%) to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98 and self-crosslinking acrylic homopolymer emulsion Zhanxin SETAQUA 6799 in Example 1. Otherwise, they are the same as in Example 1.

[0076] Comparative Example 6 The only difference between Comparative Example 6 and Example 1 is that Comparative Example 6 uses an equal amount of self-crosslinking acrylic copolymer emulsion (RHECHEM 6018 acrylic emulsion, MFFT: 7°C, non-volatile content: 43-45wt%) to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98 and self-crosslinking acrylic homopolymer emulsion SETAQUA 6799 in Example 1. Otherwise, they are the same as in Example 1.

[0077] Comparative Example 7 The only difference between Comparative Example 7 and Example 1 is that Comparative Example 7 uses an equal amount of self-crosslinking acrylic homopolymer emulsion (BASF Picassian AC-290, MFFT: <5°C, non-volatile content: 43-45wt%) to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98 and self-crosslinking acrylic homopolymer emulsion SETAQUA 6799 in Example 1. Otherwise, they are the same as in Example 1.

[0078] Comparative Example 8 The only difference between Comparative Example 8 and Example 1 is that Comparative Example 8 uses a non-self-crosslinking acrylic emulsion (Mowilith DN 7979, MFFT: 2°C, non-volatile content: 49-51wt%) to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98 and the self-crosslinking acrylic homopolymer emulsion SETAQUA 6799 in Example 1 in equal amounts. Otherwise, it is the same as Example 1.

[0079] Comparative Example 9 The only difference between Comparative Example 9 and Example 1 is that Comparative Example 9 uses a non-self-crosslinking acrylic emulsion (Mowilith LDC 7154, MFFT: 9°C, non-volatile content: 46-48wt%) to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98 and the self-crosslinking acrylic homopolymer emulsion SETAQUA 6799 in Example 1 in equal amounts. Otherwise, they are the same as in Example 1.

[0080] Comparative Example 10 The only difference between Comparative Example 10 and Example 1 is that Comparative Example 10 uses an equal amount of non-self-crosslinking acrylic emulsion (Wanhua Lacper 4571, non-self-crosslinking acrylic emulsion, MFFT: 24°C, non-volatile content: 39-41wt%) to replace the self-crosslinking acrylic copolymer emulsion Covestro NeoCryl XK-98 and the self-crosslinking acrylic homopolymer emulsion Zenxin SETAQUA6799 in Example 1. Otherwise, they are the same as in Example 1.

[0081] Comparative Example 11 The only difference between Comparative Example 11 and Example 2 is that Comparative Example 11 uses an equal amount of self-crosslinking acrylic copolymer emulsion (Covestro NeoCryl XK-14, MFFT: 33°C, non-volatile content: 39-41wt%) to replace the self-crosslinking acrylic homopolymer emulsion Wanhua Lacper 4507 in Example 2, while the rest is the same as in Example 2.

[0082] Comparative Example 12 The only difference between Comparative Example 12 and Example 2 is that Comparative Example 12 uses an equal amount of non-self-crosslinking acrylic emulsion (Wanhua Lacper 4571, MFFT: 24°C, non-volatile content: 39-41wt%) to replace the self-crosslinking acrylic homopolymer emulsion Wanhua Lacper 4507 in Example 2, while the rest is the same as in Example 2.

[0083] Comparative Example 13 The only difference between Comparative Example 13 and Example 2 is that Comparative Example 13 uses a non-self-crosslinking acrylic emulsion (BASF Joncryl 8330 ap emulsion, MFFT: 33°C, non-volatile content: 36-38 wt%) to replace the self-crosslinking acrylic homopolymer emulsion Wanhua Lacper 4507 in Example 2 in equal amounts; otherwise, it is the same as Example 2.

[0084] Comparative Example 14 The only difference between Comparative Example 14 and Example 3 is that Comparative Example 14 uses an equal amount of Oubaodi UC 8400 VP acrylic modified polyurethane emulsion (MFFT: 50℃, non-volatile content: 39-41wt%) to replace the polycarbonate modified polyurethane emulsion Zhanxin DANTAN TW6450 / 30WA in Example 3, while the rest is the same as in Example 3.

[0085] Comparative Example 15 The only difference between Comparative Example 15 and Example 2 is that Comparative Example 15 uses pure water to replace the silane in Example 2 in an equal amount; otherwise, they are the same as in Example 2.

[0086] Comparative Example 16 The only difference between Comparative Example 16 and Example 1 is that Comparative Example 16 uses ACTICIDE DT antifungal agent to replace the acetic acid M848 and acetic acid M188 in Example 1 in equal amounts; otherwise, they are the same as in Example 1.

[0087] Comparative Example 17 The only difference between Comparative Example 17 and Example 1 is that Comparative Example 17 uses pure water to replace the M848 and M188 of Example 1 in equal amounts; otherwise, they are the same as in Example 1.

[0088] Comparative Example 18 The only difference between Comparative Example 18 and Example 1 is that Comparative Example 18 uses 0.4g of UV absorber (BASF 9945DW) and 0.2g of UV stabilizer (BASF 123DW) instead of the antifungal agent and 0.15g of pure water in Example 1. Otherwise, they are the same as in Example 1.

[0089] Comparative Example 19 The only difference between Comparative Example 19 and Example 1 is that Comparative Example 19 uses pure water to replace the wetting agent in equal amounts; otherwise, it is the same as Example 1.

[0090] Comparative Example 20 The only difference between Comparative Example 20 and Example 1 is that Comparative Example 20 uses an equal amount of COAPUR 830W from Gaotai to replace Hemings Rheolate 299, i.e. it does not contain low-shear polyurethane thickener, otherwise it is the same as Example 1.

[0091] Comparative Example 21 The only difference between Comparative Example 21 and Example 1 is that Comparative Example 21 uses an equal amount of Hemings Rheolate 299 to replace Gaotai COAPUR 830W, i.e. it does not contain medium-shear polyurethane thickener, otherwise it is the same as Example 1.

[0092] Performance testing The performance of the water-based wood clear topcoats prepared in Examples 1-4 and Comparative Examples 1-21 was tested. The test items and methods involved are as follows: Viscosity: Tested according to GB / T 9269-2009 Method B; Fineness: Tested according to GB / T 1724-2019; Chemical resistance (water resistance / alkali resistance / alcohol resistance): Tested according to 6.4.16, 6.4.17 and 6.4.18 of GB / T 23999-2009 respectively; Stain resistance (tea / vinegar / red wine / coffee): Tested according to 6.4.19 of GB / T 23999-2009; Artificial weathering resistance (xenon lamp 256h, non-solid wood board, standard condition, i.e. test board after drying without freeze-thaw treatment): After drying the board according to Table 3, test according to GB / T 1865-2009. Artificial weathering resistance (xenon lamp 200h, non-solid wood board, after freeze-thaw): After the board is prepared and dried according to Table 3, the test board is placed in a freeze-thaw environment for treatment, and then tested according to GB / T 1865-2009; the freeze-thaw environment is: -10℃±2℃ freezing for 3h, 50℃±5℃ heating for 3h, room temperature 23±2℃ for 18h) as 1 cycle, and 5 cycles are repeated; Anti-blocking property: Tested according to GB / T 23982; A-0, B-0, C-0, the anti-blocking property decreases in that order, but all three indicate that the paint film is not damaged and there is no obvious adhesion. Below C-0, none of them meet the requirements (e.g., D-1, E-1, etc., indicating uniform adhesion and failure). Non-volatile matter (%): Tested according to GB / T 1725-2007; Storage stability (state in container): Tested according to 6.4.5 of GB / T 23999-2009; Freeze-thaw resistance: Tested according to GB / T 9755-2014; Mildew resistance: Tested according to GB / T 1741-2020; Appearance (brush / spray / roller coating): Refer to the provisions of 6.4.7 in GB / T 23999-2009, visual inspection; Application methods (brush / spray / roller): Refer to section 5.4.2 of GB / T 23997-2009; Yellowing resistance ΔE (2000h, transparent): Tested according to GB / T 23987-2009; Gloss / 60°: Tested according to GB / T 9754-2007; Anti-graffiti properties (transparent) (ink / whiteboard marker blue / watercolor pen green / watercolor pen red / watercolor pen purple): Tested according to GB / T 33394-2016; Artificial weathering resistance (xenon lamp 1000h, solid wood, transparent): After the board is prepared and dried according to Table 3, the test shall be carried out in accordance with GB / T1865-2009. Artificial weathering resistance (2000h xenon lamp, solid wood, transparent): After the boards are prepared and dried according to Table 3, the test shall be conducted in accordance with GB / T1865-2009. Outdoor exposure (2 years, transparent): After the test plates are prepared and dried according to Table 3, place them on an outdoor exposure rack and fix them in place. Observe the changes on the plate surface. Cracks and mildew are observed by visual inspection. Loss of gloss and discoloration are observed according to the provisions of 4.1 and 4.2 in GB / T 1766, respectively. Outdoor sun exposure (3 years, black walnut color): After the test boards are prepared and dried according to Table 3, place them on an outdoor sun exposure rack and fix them in place. Observe the changes on the board surface. Cracks and mildew are observed by visual inspection. Loss of gloss and discoloration are observed according to the provisions of 4.1 and 4.2 in GB / T 1766, respectively.

[0093] The requirements for the preparation of test samples in the artificial weathering resistance and outdoor exposure tests are shown in Table 3.

[0094] Table 3: Requirements for the preparation of test specimens in artificial weathering and outdoor exposure tests.

[0095] (1) The test results of the water-based wood clear topcoat of Examples 1 and Comparative Examples 1-10 are shown in Table 4.

[0096] Example 1, Comparative Examples 1-10: Actual images of the products after the artificial weathering resistance test (256 hours under a xenon lamp, non-solid wood panels, standard conditions) of water-based wood clear topcoat. Figure 2 As shown. Among them, Figure 2 Figures (a)-(k) are actual images of the products after artificial weathering tests for Example 1 and Comparative Examples 1-10, respectively.

[0097] Table 4: Test results of water-based wood clear topcoats in Example 1 and Comparative Examples 1-10

[0098] As can be seen from Table 4, the water-based wood clear coating of the present invention has good chemical resistance, stain resistance, artificial weathering resistance (xenon lamp 256h, non-solid wood board, standard state) and anti-blocking properties.

[0099] The abnormal artificial weathering resistance (256 hours under xenon lamp, non-solid wood board) of Comparative Examples 1 and 5, and the abnormal alcohol resistance and anti-blocking properties of Comparative Example 7, indicate that although the flexibility of the paint film can be controlled by using a single self-crosslinking homopolymer acrylic emulsion with different MFFT (5℃, 23℃ and <5℃), the artificial weathering resistance (256 hours under xenon lamp, non-solid wood board, standard condition) and the chemical resistance of the paint film cannot be achieved simultaneously. This shows that the single self-crosslinking homopolymer acrylic emulsion path cannot enable water-based wood clear topcoats to have good chemical resistance, stain resistance, artificial weathering resistance (256 hours under xenon lamp, non-solid wood board, standard condition), and anti-blocking properties.

[0100] Comparative Example 2 exhibited abnormal alkali resistance; Comparative Example 6 showed abnormal alkali resistance and anti-blocking properties; Comparative Examples 3 and 4 showed abnormal alkali resistance and resistance to artificial weathering (256 hours under xenon lamp, non-solid wood board, standard conditions). Although the self-crosslinking acrylic copolymer emulsions used in Comparative Examples 2, 4, and 6 all had a MFFT of 7℃ (the self-crosslinking acrylic copolymer emulsion used in Comparative Example 3 had an MFFT of 0℃), their properties could not simultaneously possess chemical resistance, stain resistance, resistance to artificial weathering (256 hours under xenon lamp, non-solid wood board, standard conditions), and anti-blocking properties. This indicates that a single self-crosslinking acrylic copolymer emulsion pathway cannot meet the requirements.

[0101] Comparative Example 8 exhibited abnormal alkali resistance and artificial weathering resistance (256 hours under xenon lamp, non-solid wood board, standard conditions); Comparative Example 9 exhibited abnormal artificial weathering resistance (256 hours under xenon lamp, non-solid wood board, standard conditions); Comparative Example 10 exhibited abnormal anti-adhesion properties. Although different MFFT (2℃, 9℃, and 24℃) non-self-crosslinking acrylic emulsions were used to control the flexibility and toughness of the coating film, it was impossible to achieve all of the above properties simultaneously; indicating that a single non-self-crosslinking acrylic emulsion path cannot meet the requirements.

[0102] It is evident that relying solely on a single structure of self-crosslinking acrylic copolymer emulsion, self-crosslinking acrylic homopolymer emulsion, or non-self-crosslinking acrylic emulsion is insufficient to simultaneously impart excellent chemical resistance, stain resistance, artificial weathering resistance (256 hours under xenon lamp, non-solid wood, standard conditions), and anti-blocking properties to water-based wood clear topcoats, making it difficult to achieve the desired long-term decorative protection for outdoor applications. This also demonstrates that the present invention, through a combination of a self-crosslinking acrylic copolymer emulsion and a self-crosslinking acrylic homopolymer emulsion or a polycarbonate-modified polyurethane emulsion, enables the water-based wood clear topcoat to possess all of the aforementioned properties.

[0103] (2) The test results of water-based wood clear topcoat in Examples 1-3 and Comparative Examples 11-15 are shown in Table 5.

[0104] Examples 1-3 and Comparative Examples 11, 12, and 15: Actual images of the water-based wood clear coats after artificial weathering (200 hours under a xenon lamp, non-solid wood panels, after freeze-thaw cycles) are shown below. Figure 3 As shown. Among them, Figure 3 Figures (a)-(f) are actual images of the products after artificial weathering resistance tests of Examples 1-3 and Comparative Examples 11, 12, and 15, respectively.

[0105] Table 5: Test results of water-based wood clear coats in Examples 1-3 and Comparative Examples 11-15

[0106] In Table 5, " / " indicates that the test was not conducted.

[0107] From Table 5, Figure 3 It can be seen that the water-based wood clear topcoat of Examples 1-3 of the present invention has good fineness, chemical resistance, pollution resistance, artificial weathering resistance (256h xenon lamp, non-solid wood board, standard state), artificial weathering resistance (200h xenon lamp, non-solid wood board, after freeze-thaw), and anti-blocking properties.

[0108] Comparative Example 11 used a self-crosslinking acrylic copolymer emulsion combined with a self-crosslinking acrylic copolymer emulsion (MFFT: 33℃). Comparative Examples 12 and 13 used a self-crosslinking acrylic copolymer emulsion combined with a non-self-crosslinking acrylic emulsion (MFFT: 24℃, MFFT: 33℃). Comparative Example 11 had abnormal fineness, normal resistance to artificial weathering (256h xenon lamp, non-solid wood board, standard condition), and abnormal resistance to artificial weathering (200h xenon lamp, non-solid wood board, after freeze-thaw). Comparative Example 12 had normal resistance to artificial weathering (256h xenon lamp, non-solid wood board, standard condition) and resistance to artificial weathering (200h xenon lamp, non-solid wood board, after freeze-thaw), but abnormal alkali resistance and anti-adhesion. Comparative Example 13 had abnormal alkali resistance and resistance to artificial weathering (256h xenon lamp, non-solid wood board, standard condition). This invention demonstrates that Examples 1-2 employ a combination of self-crosslinking acrylic copolymer emulsion and self-crosslinking acrylic homopolymer emulsion, enabling water-based wood clear topcoat to possess excellent fineness, chemical resistance, stain resistance, artificial weathering resistance, and anti-blocking properties. In contrast, Comparative Example 11, which uses a combination of self-crosslinking acrylic copolymer emulsion and self-crosslinking acrylic copolymer emulsion, and Comparative Examples 12 and 13, which use a combination of self-crosslinking acrylic copolymer emulsion and non-self-crosslinking acrylic emulsion, cannot simultaneously achieve the aforementioned properties.

[0109] Example 3 uses a polyurethane emulsion modified with polycarbonate, while Comparative Example 14 uses an acrylic-modified polyurethane emulsion. This results in Comparative Example 14 exhibiting abnormally high resistance to artificial weathering (256 hours under xenon lamp, non-solid wood board, standard conditions). This demonstrates that the combination of the polycarbonate-modified polyurethane emulsion and the self-crosslinking acrylic copolymer emulsion of this invention can better improve the film performance, enabling the water-based wood clear topcoat to possess excellent fineness, chemical resistance, stain resistance, artificial weathering resistance, and anti-blocking properties.

[0110] Comparative Example 15, without the addition of organosilicone alcohol, exhibited abnormal resistance to artificial weathering (200 hours under xenon lamp, non-solid wood board, after freeze-thaw cycle) and anti-blocking properties. This demonstrates that the addition of organosilicone alcohol in this invention can improve the outdoor weather resistance and anti-blocking properties of water-based wood clear varnishes.

[0111] It is evident that combining self-crosslinking acrylic copolymer emulsion with self-crosslinking acrylic homopolymer emulsion or self-crosslinking acrylic copolymer emulsion with polycarbonate-modified polyurethane emulsion, along with silanol, can enable water-based wood clear topcoats to possess excellent fineness, chemical resistance, stain resistance, artificial weathering resistance, and anti-blocking properties, thus achieving long-lasting decorative protection for desired outdoor applications.

[0112] (3) The test results of the water-based wood clear topcoat of Examples 1 and Comparative Examples 16-18 are shown in Table 6.

[0113] The storage stability results of Example 1 and Comparative Examples 16-17 water-based wood clear topcoat are as follows: Figure 4As shown. Among them, Figure 4 Figure (a) shows the storage stability results after 4 weeks of storage at room temperature. Figure 4 Figure (b) shows the storage stability results after 4 weeks of storage at 50°C.

[0114] Table 6: Test Results of Waterborne Wood Clear Coatings in Example 1 and Comparative Examples 16-18

[0115] From Table 6, Figure 4 It can be seen that the water-based wood clear topcoat of the present invention has good comprehensive properties such as storage stability, freeze-thaw stability, mildew resistance, chemical resistance, and stain resistance.

[0116] Comparative Example 16 used ACTICIDE DT antifungal agent, resulting in abnormal storage stability (in container, at room temperature) and alkali resistance. Comparative Example 17 used pure water to replace the antifungal agents M848 and M188 in Example 1, resulting in abnormal antifungal and alkali resistance. Comparative Example 18 used a UV absorber (BASF 9945DW) and a UV stabilizer (BASF 123DW) to replace the antifungal agent in Example 1, resulting in abnormal antifungal performance. This demonstrates that only by using the specific combination of functional additives of this invention can water-based wood clear topcoat achieve good storage stability, antifungal properties, and chemical resistance, thereby giving it excellent overall performance.

[0117] (4) The water-based wood clear topcoat prepared in Examples 1, 4 and Comparative Examples 19-21 was mixed into a transparent black walnut color according to the formula and the construction performance was tested.

[0118] The preparation process for the transparent black walnut color is as follows: 99.285g of water-based wood clear topcoat is added sequentially with 0.148g of commercially available water-based transparent nano iron red paste, 0.314g of commercially available water-based transparent nano black paste, 0.133g of commercially available water-based transparent nano iron yellow paste, and 0.12g of commercially available transparent weather-resistant rose red tinting agent (all commercially available tinting agents can be used to achieve the above invention). The mixture is stirred at 1500rpm for 15 minutes until homogeneous, thus obtaining the transparent black walnut color.

[0119] The application performance test results of water-based wood clear topcoat after being mixed with transparent black walnut color in Examples 1, 4 and Comparative Examples 19-21 are shown in Table 7.

[0120] Table 7: Test results of the application performance of water-based wood clear topcoat after being mixed with transparent black walnut color in Examples 1, 4 and Comparative Examples 19-21

[0121] As can be seen from Table 7, the water-based wood clear topcoat of the present invention, after being mixed with a transparent black walnut color, has good workability.

[0122] Comparative Example 19 did not contain a wetting agent, Comparative Example 20 did not contain a low-shear polyurethane thickener, and Comparative Example 21 did not contain a medium-shear polyurethane thickener. This resulted in Comparative Examples 19-21 having poorer workability than Example 1. This demonstrates that a combination of wetting agents, low-shear polyurethane thickeners, medium-shear polyurethane thickeners, and high-shear polyurethane thickeners is necessary to achieve good workability for water-based wood clear topcoats.

[0123] (5) The water-based wood clear topcoat of Examples 1-3 and Comparative Examples 16-18 were subjected to yellowing resistance, anti-graffiti and artificial aging resistance (xenon lamp) methods and outdoor exposure; at the same time, the water-based wood clear topcoat of Examples 1-3 was adjusted to a transparent black walnut color according to the formula and subjected to outdoor exposure test.

[0124] The transparent black walnut color formula is the same as the above-mentioned construction test.

[0125] The relevant performance test results of water-based wood clear topcoats in Examples 1-3 and Comparative Examples 16-18 are shown in Table 8.

[0126] Examples 1-3: Actual product images after the test of water-based wood clear topcoat's resistance to artificial weathering (1000h xenon lamp, solid wood, transparent color) are shown below. Figure 5 As shown. Among them, Figure 5 The images shown from left to right in the middle are actual photos of Example 3, Example 1, and Example 2 after artificial climate aging tests.

[0127] Examples 1-3 and Comparative Examples 16-18: Actual photos of water-based wood clear topcoat exposed to outdoor sunlight (transparent) at the beginning. Figure 6 As shown. Among them, Figure 6 Figures (a) to (f) are actual photos of Examples 1-3 and Comparative Examples 16-18 at the beginning of outdoor sun exposure, respectively.

[0128] Example 1-3: Water-based wood clear topcoat, mixed with transparent black walnut color, exposed to outdoor sunlight (transparent black walnut color) – initial product photos are shown below. Figure 7 .in, Figure 7 The images shown from left to right in the middle are actual photos of the objects at the beginning of outdoor sun exposure in Examples 1-3.

[0129] Examples 1-3 and Comparative Examples 16-18: Actual photos of water-based wood clear topcoat after two years of outdoor exposure (transparent). Figure 8 As shown. Among them, Figure 8 Figures (a) to (f) are actual photos of Examples 1-3 and Comparative Examples 16-18 at the beginning of outdoor sun exposure, respectively.

[0130] Examples 1-3: Actual photos of water-based wood clear topcoat in a transparent black walnut color after three years of outdoor exposure. Figure 9 As shown. Among them, Figure 9 The images, from left to right, show the actual products of Examples 1-3 after three years of outdoor sun exposure.

[0131] Table 8: Performance Test Results of Waterborne Wood Clear Coatings in Examples 1-3 and Comparative Examples 16-18

[0132] In Table 8, " / " indicates that the test was not conducted.

[0133] From Table 8, Figure 5-9 It can be seen that the water-based wood clear topcoat of Examples 1-3 of the present invention and the commercially available water-based color paste for making transparent black walnut color all have good resistance to yellowing, artificial aging, and outdoor exposure, that is, they have good weather resistance and good anti-graffiti performance.

[0134] Comparative Example 16 showed poorer anti-graffiti properties (transparent) than Example 1. After 2 years of outdoor exposure (transparent), the paint film showed obvious cracking, mold growth, and discoloration, and the wood was basically rotten.

[0135] Comparative Example 17 showed normal resistance to yellowing (2000h, transparent) and anti-graffiti (transparent), but slight mold growth was observed after outdoor exposure (2 years, transparent).

[0136] Comparative Example 18 showed normal resistance to yellowing (2000h, transparent) and anti-graffiti (transparent). After outdoor exposure (2 years, transparent), slight cracking occurred, and obvious mold growth was observed at the cracks.

[0137] It is evident that only by using the combination of functional additives of this invention can the outdoor weather resistance of water-based wood clear coatings be significantly improved.

[0138] In summary, this invention combines a self-crosslinking acrylic copolymer emulsion with a self-crosslinking acrylic homopolymer emulsion or polycarbonate-modified polyurethane emulsion, silanol (or silane), functional additives, wetting agents, thickeners, and other components. The combined effect of these components results in a water-based wood clear topcoat with excellent anti-mildew properties, weather resistance, chemical resistance, stain resistance, workability, storage stability, anti-graffiti properties, and anti-blocking properties. It can be used for coating outdoor or semi-outdoor wood products and has broad industrial application value.

[0139] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A water-based wood clear topcoat, characterized in that, The water-based wood clear topcoat includes water-based emulsion, organosilicon compound, functional additives, thickener, wetting agent, and water; The aqueous emulsion includes a self-crosslinking acrylic copolymer emulsion and emulsion A; Emulsion A is selected from either self-crosslinking acrylic homopolymer emulsion or polycarbonate modified polyurethane emulsion. The organosilicon compound includes at least one of silane and silanol; The functional additives include either functional additive 1 or functional additive 2; The functional additive 1 includes mildew inhibitor A and mildew inhibitor B; the functional additive 2 includes mildew inhibitor C, ultraviolet light absorber and ultraviolet light stabilizer; The antifungal agent A comprises 2-octyl-3(2H)-isothiazolidinone; the antifungal agent B comprises 3-iodo-2-propynyl butylcarbamate; the antifungal agent C comprises 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone. The thickeners include high-shear polyurethane thickeners, medium-shear polyurethane thickeners, and low-shear polyurethane thickeners.

2. The water-based wood clear topcoat according to claim 1, characterized in that, The minimum film-forming temperature of the self-crosslinking acrylic copolymer emulsion is 3-18℃; And / or, the minimum film-forming temperature of the self-crosslinking acrylic homopolymer emulsion is 0-15°C or 30-36°C; And / or, the silane includes polysilane; and / or, the silanol includes organosilanol.

3. The water-based wood clear topcoat according to claim 1, characterized in that, When the emulsion A is a self-crosslinking acrylic homopolymer emulsion, the mass ratio of the self-crosslinking acrylic copolymer emulsion to the self-crosslinking acrylic homopolymer emulsion is (0.8-2.7):1; And / or, when the emulsion A is a polycarbonate-modified polyurethane emulsion, the mass ratio of the self-crosslinking acrylic copolymer emulsion to the polycarbonate-modified polyurethane emulsion is (0.7-3.0):

1.

4. The water-based wood clear topcoat according to claim 1, characterized in that, The weight ratio of the mildew inhibitor A to the mildew inhibitor B is 1:(0.1-0.5). And / or, the weight ratio of the antifungal agent C, the ultraviolet absorber and the ultraviolet stabilizer is 1:(0.2-2.2):(0.1-1.1).

5. The water-based wood clear topcoat according to claim 1, characterized in that, The weight ratio of the high-shear polyurethane thickener, the medium-shear polyurethane thickener, and the low-shear polyurethane thickener is 1:(0.4-1.4):(0.1-0.8). And / or, the shear rate of the high-shear polyurethane thickener is 100-2000 s. -1 ; And / or, the shear rate of the medium-shear polyurethane thickener is 5-15 s. -1 ; And / or, the low-shear polyurethane thickener has a shear rate of 0.05-0.15 s. -1 .

6. The water-based wood clear topcoat according to claim 1, characterized in that, By weight percentage, the water-based wood clear topcoat comprises 64-90% water-based emulsion, 0.1-1.0% organosilicon compound, 0.05-3.0% functional additives, 0.2-3.0% thickener, 0.1-1.0% wetting agent, and 4-22% water.

7. The water-based wood clear topcoat according to any one of claims 1-6, characterized in that, The water-based wood clear topcoat also includes at least one of the following: film-forming aid, defoamer, leveling agent, wax emulsion, anti-sagging agent, and bactericide.

8. The water-based wood clear topcoat according to claim 7, characterized in that, The water-based wood clear topcoat further includes film-forming aids, defoamers, leveling agents, wax emulsions, anti-sagging aids, and bactericides; and by weight percentage, the water-based wood clear topcoat comprises 64-90% water-based emulsion, 0.1-1.0% organosilicon compounds, 0.05-3.0% functional additives, 0.2-3.0% thickeners, 0.1-1.0% wetting agents, 2-7.0% film-forming aids, 0.2-1.0% defoamers, 0.05-1.0% leveling agents, 0.5-4.0% wax emulsions, 0.2-3.5% anti-sagging aids, 0.05-0.3% bactericides, and 4-22% water.

9. The method for preparing the water-based wood clear topcoat according to any one of claims 1-8, characterized in that, The preparation method includes the following steps: The raw material components are mixed to obtain the product.

10. A wooden product, characterized in that, Includes the water-based wood clear varnish as described in any one of claims 1-8.

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